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Electrical Machines

Electrical Machines
In a dc machine 4 pole lap winding is used. The number of parallel paths are?

 8
 4
 2
 1

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Electrical Machines
Which of the following motors has low ratings only?

 Resistance split phase
 Capacitor run
 Shaded pole
 Capacitor start

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Electrical Machines
An electric motor with constant output power will have a torque speed characteristics in the form of a

 Circle about the origin.
 Rectangular hyperbola
 Straight line through the origin.
 Straight line parallel to the speed axis.

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Electrical Machines
When the excitation of normally operating unloaded, salient pole synchronous motor suddenly gets disconnected, it continues to run as a

 DC motor.
 induction motor.
 variable reluctance motor.
 switched reluctance motor.

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Electrical Machines
The breakdown torque of a synchronous motor varies as

 1/V
 V²
 applied voltage V
 1/V²

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Electrical Machines
The principle of dynamically induced emf is utilized in

 choke.
 thermocouple.
 generator.
 transformer.

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